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тАО05-25-2005 03:15 PM
тАО05-25-2005 03:15 PM
I would just like to ask for suggestion on how to monitor the disk performance of EVA5000 disk.
1 Disk Group
80 physical disk (72 Gb each)
3 LUNs (250 Gb)
I assigned 3 LUNs to one vg01, this volume has 18 logical volume for database dbf files.
Based from glance, this is a disk IO on LUN1. This is because the 3 LUNs are only 50 % utilized on the filesystem. LUN1 PEs are all asigned to the lvols while LUN2 PEs are has 50% free PEs and LUN3 was not even used yet on the lvol.
Is it correct that spreading the dbf's on the 3 LUNs (3 vgs, 1 LUN each) will be the same from my current conifg (1 VG, 3 LUN) since we are using EVA?
Regards,
Paul
Solved! Go to Solution.
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тАО05-25-2005 05:07 PM
тАО05-25-2005 05:07 PM
SolutionWhen a LUN created in EVA, it uses all the available disks in the disk group. This way, EVA uses all the disks to serve any request from any VG.
Even if you span the dbf files across VGs the same number of physical disks(80 in your case)in EVA are going to work to serve the request. By spanning dbf files to different VGs(LUNs) from HP-UX side you will not find high I/O on a single LUN but but performance going to be the same.
Still, If you want try, you can create single lvol in the current VG such that it uses all the three LUNs.
Calculate the size of the required file system and devide by three. Allocate 1/3 of size to each LUN in the same VG.
lvcreate
lvextend -L <1/3 of req size in MB>
lvextend -L <1/3 of req size in MB>
lvextend -L <1/3 of req size in MB>
In future also, you can follow the procedure for extedning LUN further so that it will be equally devided.
regards,
Madhu
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тАО05-25-2005 05:11 PM
тАО05-25-2005 05:11 PM
Re: EVA5000 performance monitoring
In case of EVA 5K, any LUN which is created has stripes on all the disks available in that disk group.
In your case, the LUNs which you have created, they will have stripes on all the 80 disks available in the disk group. Now it is too difficult to tell where exactly the lvols resides.
But the performance in both the above cases (3 VGs or 1 VG) would remain similar.
Regards,
Suraj
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тАО05-25-2005 05:34 PM
тАО05-25-2005 05:34 PM
Re: EVA5000 performance monitoring
Is there any metrics on EVA where I can get this information or I/0 statistics?
Regards,
Paul
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тАО05-25-2005 05:50 PM
тАО05-25-2005 05:50 PM
Re: EVA5000 performance monitoring
I don't think you can get the IO statustics from EVA, but if your EVA is connected to a Brocade Fabric, you can use "portperfshow" command on fabric to see the IO on EVA.
Regards,
Suraj
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тАО05-25-2005 06:25 PM
тАО05-25-2005 06:25 PM
Re: EVA5000 performance monitoring
I don't think you can get the IO statustics from EVA, but if your EVA is connected to a Brocade Fabric, you can use "portperfshow" command on fabric to see the IO on EVA.
Regards,
Suraj
Thanks Suraj,
I am not familiar with brocade switch command, but is there a way to capture the output of "portperfshow" or are there any logs where I can get the history of this logs.
Regards,
Paul
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тАО05-25-2005 07:04 PM
тАО05-25-2005 07:04 PM
Re: EVA5000 performance monitoring
WORKAROUND
==========
You may use "HYPERTERM" in windows to telnet to the switch and start "capturing text", or alternatively, if you telnet from any unix host, just start "script" before you telnet to the switch.
Regards,
Suraj
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тАО05-25-2005 08:11 PM
тАО05-25-2005 08:11 PM
Re: EVA5000 performance monitoring
In EVA5000,the LUN is uses all the available disks in the diskgroups.
Regards
Mahesh Gowda
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тАО05-26-2005 07:45 AM
тАО05-26-2005 07:45 AM
Re: EVA5000 performance monitoring
ftp://ftp.hp.com/pub/softlib/software5/COL10654/co-31023-1/5983-1674EN_EVAperfMetrics_WP.pdf
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?locBasepartNum=co-30754-1тМй=English
HTH
Duncan
I am an HPE Employee
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тАО05-26-2005 07:47 AM
тАО05-26-2005 07:47 AM
Re: EVA5000 performance monitoring
Duncan
I am an HPE Employee